I donít think I ever had that issue with my 2018 ATASóany power curve issues.
And I just got back from a test run trying to see if I could duplicate the sort of thing Petros describes but couldnít find any issues.
If I'm doing 80 mph (130kph) in 6th gear and bang itófull throttleóthe power is nearly instantaneous, negligible lag (however, I slow as I reach 100mphóhavenít had the opportunity to take it much faster yet). As I wrote above, if I'm doing 50mph in 6th, there is a bit of a delay, but the power comes on in one continuously accelerating motion, faster, faster, gone.
And in 4th doing 40-45mph or 5th doing 50-55mph, itís much the sameónearly immediate and smooth, ever faster.
However, having said as much, I agree with Harleywilma too: from about 650 miles on, the bike seems to have come into itself some, everything getting smoother (shifting, engine revving, idling, etc.) while at the same time becoming more responsive, and seemingly more powerful.
And idling in 1st gear around a parking lot is now nearly smooth as silk compared to what it was like with around 300 Ė 500 miles on the bike. (I'm now at around 750 miles on the bike). Idling in circles, no throttle, in 1st, is so very smooth, nearly perfect, zero lag or any of that slight back and forth I used to get. The rpm's seem to be nailed in place.
And my engine always idled pretty well while parked, but early on there was some slight variation and a few times where she nearly coughed a bit here and there. But thatís all gone now too.
750 miles isnít a whole lot, I realize that, but it seems to be all my bike needed to get exercised into what seems like a premium state of health.